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This article was originally published as: Jahromi, M. E., & Khiadani, M. (2017). Experimental study on oxygen transfer capacity of water jets discharging into turbulent cross-flow. Journal of Environmental Engineering, 143(6), 04017007. Original article available here

Abstract

Plunging water jets are used for oxygenation purposes due to their inherent advantages such as simplicity, energy efficiency, and low operational cost. Specifically, these provide an efficient gas-liquid interfacial area for dissolving oxygen in water. Oxygen transfer by plunging jets into stagnant water has received considerable attention; however, the oxygenation capacity of plunging water jets discharging into turbulent cross-flow has received limited attention. The flow characteristics such as volumetric oxygen transfer coefficient and standard oxygen transfer efficiency are evaluated considering water jet to cross-flow velocity ratio, jet fall height, cross-flow depth, and jet impact angle. Two equations are proposed for estimating the oxygen transfer rate for a single plunging jet in a turbulent cross-flow. Moreover, the dynamic behavior of the resulting two-phase air-water flow is investigated with the aid of flow visualization.